Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

[Anton Robert]

Ok thank you for the picture. Looks like a Durst L1800. Having one of the gears will allow you to figure the pitch and physical width. Knowing the shaft centers will give the diameter of the new gear. You should be able to have one CNC or 3d printed.

Would you perhaps have a wiring diagram for the Durst CLS300 head and power supply Unit?


Thank You, good to know it's the Durst L1800, there is not much information around anymore, much appreciated.

[Andrea Gazzoni]

not sure if it's better to post here or in a separate thread.
anyways, I just got a G-Componon 100mm lens that I planned to use on my Durst enlarger with the Laratub recessed lensboard.
The problem is the lens has a 50mm mounting thread, while the lensboard has a 39mm thread (red arrow in the picture).
The thread in the lensboard looks like it is an adapter ring, the silver part in this picture is 50mm wide (yellow arrow), but it doesn't seem to come off.
Any idea? I understand if this won't come off the only option may be drilling a larger hole in the lensboard and then maybe having an adapter from 50 to 39mm made for future needs.
thanks

[ic-racer]

I'd get a different lens. There must be a million 100mm lenses out there but very few Laratubs. I'd not damage the Laratub.

Unless you are making 40" images from 6x9cm negatives, why not use a 135mm and mount it on a flat lensboard. I use my Laratub only for 50mm lens. Even an 80mm will focus on a moderately recessed lensboard on my enlarger so I suspect the 100mm might focus on a flat lensboard. Have you tried it?

With the 80mm mounted like that the turret won't rotate. Just remove the lensboard when not using it and cap the hole with a lid from a water bottle or put a different lens to fill the hole.

Or mount the 100mm lens on a Unipla which does not rotate.

[Andrea Gazzoni]

well, not that I've seen a million of these G lenses lately

[Andrea Gazzoni]

yes the plan is to print up to 40" from 6x7 negatives. I would like to use the Laratub, as I suspect you get some bellows compression with a flat lensboard. All of this is pure speculation on my side, as I cannot unbox the enlarger currently in storage

[ic-racer]

well, not that I've seen a million of these G lenses lately

I thought maybe you intended to type "S" as I thought the shortest "G" was a 150mm.

So, indeed you have a very rare lens!

The manual for L1840 indicates a 100 will mount on a 50mm Lapla flat lensboard on a Unipla.

[Andrea Gazzoni]

thanks IC.
so it seems they only made the Laratub for M39 lenses

[ic-racer]

I'd be curious to see a picture of the "G" Componon. I have never seen one in person.

[Andrea Gazzoni]

there you go.
the illuminated fstop scale is really a thing.
also have the 240 G-Componon but it doesn't sport such a sleek feature.

[Andrea Gazzoni]

the recess in the Laratub is so deep that my 100mm is all inside it and the fstop scale is completely hidden. I wonder how you do with your 50mm. looks like setting the aperture requires temporarily removing the lens from the Laratub.

yes, Unipla + Lapla looks like a better option provided that the bellows allows it (mine is a L184)